Take-up sprocket for motion-picture machines.



G. R. BECK.

TAKE-UP SPROGKET FOR MOTION PICTURE MACHINES.

APPLICATION FILED 0GT.12, 1911.

1,125,045. Patented Jan. 19, 1915.

lfQimewao UNITED STATES PATENT OFFICE.

CHARLES 30mm seen, or nmannsolv, fianmna.

TAKE-UP SPROCKET FOB-KOTION-PICTUBE MACHINES.

Specification of Letters Patent.

Patented Jan. 19,1915.

Application filed October 12, 191 1. Serial 110. 654,208.

Sprockets for Motion-Picture Machines, of

which the followin is a specification.

This invention re ates to'im rovements in motion picture machines, an particularly to a sprocket for guiding the film in front of the shutter. 7

One object of the invention is to provide a film feeding and take-up sprocket whereby the liabilityof the film breaking is reduced to a minimum.

Other objects and advantages will be apparent from the following description and with particular reference to the accompanying drawings' a In the drawings: Figure 1 is an enlarged longitudinal sectional view of one of the feeding and take-up sprockets for the fihn, and Fig. 2 is an end view thereof.

teeth 14 for engagement with the openings at'theedges of the film. This sleeve ll 'is secured on the shaft 10 by the screw 15 and rotates therewith. Each of the sprockets is provided with a recess 16 in which is secured a spring pawl 17. The-pawls 1'1 engage with their free ends the teeth of the ratchet wheels 18 which are secured to the Referring particularly to the drawings,

"reduced portions 12 by the screws 18' and rotatable with the sleeve 11. so that when the shaft 10 rotates the ratchets and pawls Wlll be in engagement to drive the sprockets 13 to feed the film forward. Should the film loop become straightened out the sprockets 13 would rotate faster, than the shaft 10 thus avoiding anyfstroiig pull between the feed sprockets and the usual intermittent sprockets (not shown) thus preventing any great strain on the film which might result in tearing of breaking the' same.

From the foregoing it will readily "be seen that while the movement of the film is positive, still should the tension on the film become increased the sprockets would slip on the shaft at a speed greater than that of the shaft, so that the operator could, while still turning the crank, reach in the machine and pull the loops out.

What is claimed is: v In a device of the kind described, a shaft having a sleeve thereon, a sprocket wheel mounted at each end of said sleeve, a ratchet member rotatably mounted on each end of the sleeve outside of said sprockets, means to lock said ratchet member on the sleeve whereby the ratchet member may be adjusted around the sleeve and held in ad- JllSted position, said ratchet member when so adjusted serving as a collar for the sprocket, a pawl carried by each sprocket and engaging a'respe ctive ratchet member.

In testimony whereof I aflix my signature, in the presence of two witnesses. 7

CHARLES RODNA BECK.

Witnesses:

PHILIP B. ONEILL, J0me Garcser. 

